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Disclosed is a method for using fiber optics to reroute LED
light for color vision inspection at the board level. Benefits include lower
cost and a more reliable inspection.

Background

Currently, color vision inspection is conducted by mounting
LED cameras at random locations on the board (at primary and/or secondary
sites) depending on chassis design. The cameras have x-y motion capability to
cover an inspection window up to 18 x 14 inches (maximum board size). To
maintain LED color inspection resolution, the inspection window is divided into
several small inspection cells for reliable color checking. Using these top,
bottom, and side mounted LED cameras, it is difficult to achieve a high beat
rate while maintaining a low tester cost. In addition, rapid x-y motion
requires high-speed servo motors, while bottom and side mounted LED require
additional cameras for inspection.

Figure 1 shows a LED color inspection using multiple top,
bottom, and side cameras; the amount of hardware required for this type of
inspection greatly increases the cost of the LED color vision tester.

General Description

The disclosed method simplifies color inspection by using
fiber optics to reroute LED light from random locations on the board to a fixed
inspection window (see Figure 2). The fiber optics are about 0.125 inch in
diameter, consisting of a bundle of very small glass fiber strands, each ab...